5-Fluorouracil (5-FU) Pharmacology Quiz
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Questions and Answers

What is the primary reason Leucovorin is administered with 5 FU?

  • To decrease the rate of 5 FU metabolism in the liver
  • To increase 5 FU's incorporation into DNA
  • To inhibit thymidylate synthase (correct)
  • To increase 5 FU's penetration into the CNS
  • Where is 5 FU metabolized rapidly?

  • Skin
  • Lung
  • Liver (correct)
  • Brain
  • What can elevated levels of dihydropyrimidine dehydrogenase (DPD) lead to?

  • Enhanced bioavailability of 5-FU
  • Increased risk of thrombosis
  • Decreased 5-FU catabolism (correct)
  • Enhanced activity of thymidylate synthase
  • Which enzyme is responsible for the hydrolysis of capecitabine to 5FU?

    <p>An unknown enzyme</p> Signup and view all the answers

    In which phase of the cell cycle does 5 FU produce its anticancer effect?

    <p>S phase</p> Signup and view all the answers

    What can happen to patients with DPD deficiency when treated with 5-FU?

    <p>Severe toxicity manifested by pancytopenia and mucositis</p> Signup and view all the answers

    What is the main cytotoxic activity of capecitabine and 5-FU?

    <p>Inhibition of thymidylate synthase</p> Signup and view all the answers

    Which enzyme is primarily concentrated in tumors and catalyzes the conversion of thymidine?

    <p>Thymidine phosphorylase</p> Signup and view all the answers

    What is the major clinical use of cytarabine?

    <p>Acute nonlymphocytic leukemia (AML)</p> Signup and view all the answers

    Which metabolite of cytarabine is pharmacologically inactive?

    <p>Ara-U</p> Signup and view all the answers

    How does azacitidine primarily inhibit RNA processing and function?

    <p>Incorporation into RNA</p> Signup and view all the answers

    Which phase of the cell cycle is affected by Ara-CTP, the active form of cytarabine?

    <p>S phase</p> Signup and view all the answers

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